13. The hosing used to convey the compressed air from the machine to the tool, or to any other appliance that may be applied, must have a cock at one end of the hose connection, this cock should be kept closed when connecting the hosing to the tool and the machine in order to prevent the risk of accidental opening of the cock itself with the consequent risk of severe wobbling of the hosing itself, and even a risk of personal injury. Before disconnecting any piping, always make sure that there is no internal pressure
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